Meter for alternating electric currents



(No Model.)

0. B. SHALLENBERGER. METER FOR ALTERNATING ELEUTRIC UURRENTS.

No. 448,676, Patented Mar. 24, 1891.

wlfnesses Zmmzfor if r NITED STATES PATEN rrrcn.

OLIVER B. SHALLENBERGER, OF ROCHESTER, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO THE \VESTINGHOUSE ELECTRIC AND MANUFACTURING COM- PANY, OF PITTSBURG, PENNSYLVANIA.

METER FOR ALTERNATING ELECTRIC CURRENTS.

SPECIFICATION forming part of Letters Patent No. 448,676, dated Ma 24, 1891- Application filed March 13 1890. Serial No. 343,704. (No model.)

To aZ Z whom it may concern: verters or transformers are connected, as Be it known that I, OLIVER B. SHALLEN- shown at C. The primary coils are connected iBERQER, a citizen of the United States, residin the main circuits L L and the secondary mg 111 Rochester, in the county of Beaver and coilssupply translating devices-such, for in 5 State of Pennsylvania, have invented a cerstance, as incandescent electric lamps, as

tain new and useful Improvement in Meters shown at d. for: Alternating Electric Currents, (Case No. More or less current will leak through the 20 of which the following isa specification. primary coils of the converters even when lhe nvention relates to certain improvetheir secondary circuits are open. This our- 10 ments 1n the construction of apparatus for rentis usuallytermedleakagecurrent. The measuring the electric currents consumed in percentage of current thus consumed is small; dolng useful work in an alternating-current but it becomes appreciable in amount when circuit. several converters are connected in parallel.

The ob ect of the invention is to provide It is evident that if a consumer pays for our- 15 means whereby a meter of the general charrent by reference to a meter it would not be acter described in certain Letters Patent isproper to record upon the meter the current sued to me 011 the 14th day of August, 1888, thus consumed, but only that used in doing Nos. 388,003 and 388,004, may be employed useful Work. To avoid this the meter is confor measuring only the current consumed in structed so that it will respond only when this 20 doing useful work, while it is not operated by leakage-currentis exceeded, or, in other words, the leakage'current, or such current as may only when current is allowed to flow through flow when no work is being done. Such apthe translating devices. paratus is of special utility in connection with The invention is applicable to other forms a circuit employing electric converters or of meters than that described in the patents 2 5 transformers, for the reason that there is pracreferred to but it is particularly adapted to ticaily more or less leakage through the prithat form. The plan whereby, according to many coils of the converters even when no thepresent invention, this result is secured workis beingdonein their secondarycircuits, consists in constructing the armature A so and therefore a meter placed in the primary that when at rest it has a tendency to stand 30 circuit is subjected to a continual flow of curin a given position with reference to the coil rent, which would cause the meter to register or circuit C, which is closed upon itself and unless provision were made to the contrary. which stands at an angle with reference to the Myinvention consistsin constructing a mecoil B, the coil B being connected in the priter so that the armature will require a certain mary circuit L. \Vhile the armature stands 3 5 value of current to set it in operation by reain this position it requires a predetermined son of a dead-point being formed in the armainitial current to set-it in motion. The inertia ture. A current of the value which will leak being once overcome, the armature will conthrough the circuit when no work is being tinueto revolvewithincreasingrapidityasthe done will be insufiicient to overcome this current increases. To accomplish this the 0 dead-point; but when the increase of current armature is cut away on two sides, as shown 0 required to operate the translating devices at a a, so that the diameter is greater in the flows then the armature responds and the medirection 00 0:. The armature will then stand ter will record. in the position shown in the drawing so long The accompanying drawing illustrates a as the current flowing is insufficient to over- 45 method of carrying the invention into effect. come the tendency of the armature to set it- 9 5 Referring to the figure,G represents any self in this position. This tendency may be suitable source of alternating, intermittent, or augmentedbyplacinga copper band on around pulsatory electric currents,and L'L conductthe armature in such direction that the polar ors leading therefrom to the work-circuit. In line established by the induced currents cir- 5 o this work-circuit any required number of conculating in it will be in the direction 02 0c, The

3. In an electric motor for alternating currents, a primary inducing-coil a secondary coil placed at an angle therewith, and an armature in the inductive field of both of said coils,

, circular in form,but flattened at one or more among other forms of meters that herein? shown, and claim is made upon the broad method of operation.

I claim as my invention 1. The combination, with an alternatingcurrent electric circuit, of a motor having a primary coil, a secondary coil placed at an angle therewith, and a rotating armature acted upon by the inductive influence of the currents traversing said coils, said armature having dead-points, substantially as described.

2. In an electric meter for alternating currents, an armature constructed with deadpoints, substantially as described.

points, substantially as described.

4-. The combination, in an electric meter for alternating electric currents having a primary inducing-coil, a secondary coil at an angle therewith, and an armature in inductive relation to both of said coils, of an independent band of conducting material surrounding said armature.

In testimony whereof I have hereunto subscribed my name this 28th day of February, A. D. 1890.

OLIVER ll. SIIALLENBERGER.

Witnesses:

S. R. ROSEMAND, J. \V. SMITH. 

